单项选择题 图示简支梁受到集中力作用（l = a+b），下列结论错误的是（  ）。

未知题型 Why does the author say 'spring cleaning can't wait'?A.Because there will be more activities when it gets warmerB.Because the air is fresher and the breeze is lighter.C.Because the whole family is full of energy at spring timE.D.Because the snow is melting and the ground is thawing.

未知题型 'Harrington... made sure she was never off executives' radar' (Paragraph Four) means that she______.A.herself wanted to be a company executiveB.meant to hire executives to run the businessC.meant to keep her management knowledge and skillsD.focused on the management of the bakery business

未知题型 According to the passage, which of the following is fundamental to Harrington's success?A.Perseverance and concern for employees.B.Business expansion and family support.C.Efficiency and love for the family.D.Opportunities and speeD.

未知题型 听力原文：W: Well, Mr. Smith, we have had an interesting discussion about your work. Now, tell us something about your after work activities.M: I guess not much different from everyone elsE.I'm interested in sport, and I run about three miles every day. I particularly enjoy cross-country running, where you have to run across fields, jump over streams and so on While I'm running I think about all sorts of things, and at the end of a run I'm sometimes surprised to find that I've managed to solve a problem that was on my minD.Next year I'm going to try the London Marathon. It's a long, hard race--26 miles, or 42 kilometers--and you have to be tough to finish, but I very much want to do it. I worry a bit about getting old, and I'd like to prove to myself that I'm still almost as fit as I was twenty years ago.I'm interested in climbing as well as running. I'll never become an expert climber, but I know what I'm doing in the mountains. I successfully completed a course in snow and ice climbing when I was younger, and I've done a series of easy climbs in the Alps during the last few years. My wife doesn't share my interest in Mountains. She agreed to go climbing with me once, but she found that she felt iii as soon as she got above 1,000 meters, so we decide to follow different hobbies.W: You certainly seem to enjoy various types of recreation. All right, Mr. Smith. Thanks for your interesting talk.What are the man's hobbies?A.Running and thinking.B.Running and jumping.C.Running and climbing.D.Running and skiing.

未知题型 What is the speaker's main topic?A.Training for a professional athletE.B.His ways of physical training.C.How to do cross country running.D.How to do mountain climbing.

单项选择题 血吸虫病的尾蚴性皮炎病理变化表现为 A. 皮肤化脓及溃疡形成         B. 皮肤出现玫瑰疹 C. 真皮无变化     D. 真皮充血、出血和水肿  E. 表皮过度角化

未知题型 听力原文：W: Hi, Tim. I'm really sorry to hear about your grandfather. My sincerest sympathies go out to you and your family. He was such a great man.M: Thanks. As you know, he had been sick for some time before he passed away, so we were somewhat prepareD.W: So, how's your grandmother taking it?M: Oh, it's been really hard on her. I don't think you get over something like that.W: Yeah, I'm surE.My heart really goes out to her. Uh, so how's your grandmother going to be able to manage things alone?M: Well, financially, grandmother will be able to live a secure life from now on. I mean, grandfather had life insurance and substantial investments in property and stocks, so returns on those should take care of her. But our main concern at this moment is her emotional statE.She's really down, so a call now and again should brighten her day.W: So, what are the funeral arrangements?M: Well, some of the family members will get together on Tuesday morning for a private memorial service, but there will be a viewing in the afternoon from 2:00 to 3:00, followed by the funeral servicE.W: I wish there was something I could do for you.M: Well, actually, there is. You know, grandfather really admired you a lot, and before he died, he asked if you'd sing a musical number at the funeral.W: Really? I'd be honoreD.M: It would really mean a lot to the family.W: SurE.Then, see you on Tuesday.M: Okay, see you then.(20)A.He fell ill and passed away unexpectedly.B.He died in a traffic accident.C.He was ill for a certain period of time and then passed away.D.He passed away when he was working.

未知题型 听力原文：M: Good morning. Today we'll be talking about goal-setting and we have a special guest here, Kate Warwick. Welcome to our program, Mrs. Warwick.W: Thank you.M: So Mrs. Warwick, can you tell us about your work in goal-setting?W: OK. When it comes to goal-setting, I'm really focuseD.For example, if I want to lose weight, I will get a group of friends around me and tell them I want to lose weight and increase my health. Then I'll take actions to achieve this goal by refraining from eating poor foods, etC.M: Well, why do you gather some close friends together?W: It is important for me because I need support. I know I can't do it on my own, Also it helps because I am able to share my problems with them. And by telling other people, 'I really want to do this and I seek your help', they can keep you honest I supposE.M: So setting goals helps people achieve something. But is there anything negative about goal-setting?W: Yes. If you set yourself a goal and you're so focused on it, then you will be close-minded to other things that happen.M: Why is it that most people do so badly at reaching goals?W: They lose focus. Everybody's life is busy. There is so much happening in everybody's life that what happens is that they might have a goal, and then something will get in the road of that.M: Once you reach a goal, what's the next step?W: One thing that I would strongly encourage is to celebrate success. Once you have made and reached that level, it is a real must to celebrate it. That way you are acknowledging it to yourself, you're acknowledging this level of achievement.(23)A.She wants her friends to lose weight too.B.She wants her friends to do exercises with her.C.She wants her friends to eat poor foods with her.D.She needs her friends' support and help with her problems.

单项选择题 遗传变异和表观遗传变异可以共同作用维持生殖隔离，避免物种的融合。（ ）